Some advice please. I have a Model 27 Marantz, 30 RMS per channel, with 2 speakers, all bought in 1970. It is in a 25 x 25 room and sounds good with classical music. For better sound, similar to surround sound, can I add 2 good speakers so that I will have 4 speakers, one in each corner. With this arrangement, what speakers do you advise and can I use a switching system so that television and stereo can be played on same speakers. Or, should I start over with a system that will provide surround sound and high quality audio. We don't have any sound stores within 100 miles so that I can shop and compare, other than circuit city, Sam,s, etc. I don't want Bose. Any suggestions are appreciated.